/Engine/Plugins/MovieScene/MovieSceneTextTrack/Source/MovieSceneTextTrack/Public/MovieSceneTextChannel.h
Get this channel's default value that will be used when no keys are present
(Optional) The channel's default value
[TOptional](API\Runtime\Core\IO\TOptional)< [FText](API\Runtime\Core\Internationalization\FText) > GetDefault() const